ypmatch_cache.c revision 1.3 
1/*	$OpenBSD: ypmatch_cache.c,v 1.3 1996/07/01 07:09:17 deraadt Exp $	 */
2
3/*
4 * Copyright (c) 1992, 1993 Theo de Raadt <deraadt@theos.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by Theo de Raadt.
18 * 4. The name of the author may not be used to endorse or promote products
19 *    derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
22 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
25 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#if defined(LIBC_SCCS) && !defined(lint)
35static char *rcsid = "$OpenBSD: ypmatch_cache.c,v 1.3 1996/07/01 07:09:17 deraadt Exp $";
36#endif
37
38#include <sys/param.h>
39#include <sys/types.h>
40#include <sys/socket.h>
41#include <sys/file.h>
42#include <sys/uio.h>
43#include <errno.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <string.h>
47#include <unistd.h>
48#include <rpc/rpc.h>
49#include <rpc/xdr.h>
50#include <rpcsvc/yp.h>
51#include <rpcsvc/ypclnt.h>
52#include "ypinternal.h"
53
54int _yplib_cache = 5;
55
56static bool_t
57ypmatch_add(map, key, keylen, val, vallen)
58	const char     *map;
59	const char     *key;
60	u_int           keylen;
61	char           *val;
62	u_int           vallen;
63{
64	struct ypmatch_ent *ep;
65	time_t t;
66
67	(void)time(&t);
68
69	for (ep = ypmc; ep; ep = ep->next)
70		if (ep->expire_t < t)
71			break;
72	if (ep == NULL) {
73		if ((ep = malloc(sizeof *ep)) == NULL)
74			return 0;
75		(void)memset(ep, 0, sizeof *ep);
76		if (ypmc)
77			ep->next = ypmc;
78		ypmc = ep;
79	}
80
81	if (ep->key) {
82		free(ep->key);
83		ep->key = NULL;
84	}
85	if (ep->val) {
86		free(ep->val);
87		ep->val = NULL;
88	}
89
90	if ((ep->key = malloc(keylen)) == NULL)
91		return 0;
92
93	if ((ep->val = malloc(vallen)) == NULL) {
94		free(ep->key);
95		ep->key = NULL;
96		return 0;
97	}
98
99	ep->keylen = keylen;
100	ep->vallen = vallen;
101
102	(void)memcpy(ep->key, key, ep->keylen);
103	(void)memcpy(ep->val, val, ep->vallen);
104
105	if (ep->map) {
106		if (strcmp(ep->map, map)) {
107			free(ep->map);
108			if ((ep->map = strdup(map)) == NULL)
109				return 0;
110		}
111	} else {
112		if ((ep->map = strdup(map)) == NULL)
113			return 0;
114	}
115
116	ep->expire_t = t + _yplib_cache;
117	return 1;
118}
119
120static bool_t
121ypmatch_find(map, key, keylen, val, vallen)
122	const char     *map;
123	const char     *key;
124	u_int           keylen;
125	char          **val;
126	u_int          *vallen;
127{
128	struct ypmatch_ent *ep;
129	time_t          t;
130
131	if (ypmc == NULL)
132		return 0;
133
134	(void) time(&t);
135
136	for (ep = ypmc; ep; ep = ep->next) {
137		if (ep->keylen != keylen)
138			continue;
139		if (strcmp(ep->map, map))
140			continue;
141		if (memcmp(ep->key, key, keylen))
142			continue;
143		if (t > ep->expire_t)
144			continue;
145
146		*val = ep->val;
147		*vallen = ep->vallen;
148		return 1;
149	}
150	return 0;
151}
152
153int
154yp_match(indomain, inmap, inkey, inkeylen, outval, outvallen)
155	const char     *indomain;
156	const char     *inmap;
157	const char     *inkey;
158	int             inkeylen;
159	char          **outval;
160	int            *outvallen;
161{
162	struct dom_binding *ysd;
163	struct ypresp_val yprv;
164	struct timeval  tv;
165	struct ypreq_key yprk;
166	int             r;
167
168	if (indomain == NULL || *indomain == '\0' ||
169	    strlen(indomain) > YPMAXDOMAIN || inmap == NULL ||
170	    *inmap == '\0' || strlen(inmap) > YPMAXMAP ||
171	    inkey == NULL || inkeylen == 0)
172		return YPERR_BADARGS;
173
174	*outval = NULL;
175	*outvallen = 0;
176
177again:
178	if (_yp_dobind(indomain, &ysd) != 0)
179		return YPERR_DOMAIN;
180
181#ifdef YPMATCHCACHE
182	if (!strcmp(_yp_domain, indomain) && ypmatch_find(inmap, inkey,
183	    inkeylen, &yprv.val.valdat_val, &yprv.val.valdat_len)) {
184		*outvallen = yprv.val.valdat_len;
185		if ((*outval = malloc(*outvallen + 1)) == NULL) {
186			_yp_unbind(ysd);
187			return YPERR_YPERR;
188		}
189		(void)memcpy(*outval, yprv.val.valdat_val, *outvallen);
190		(*outval)[*outvallen] = '\0';
191		_yp_unbind(ysd);
192		return 0;
193	}
194#endif
195
196	tv.tv_sec = _yplib_timeout;
197	tv.tv_usec = 0;
198
199	yprk.domain = (char *)indomain;
200	yprk.map = (char *)inmap;
201	yprk.key.keydat_val = (char *) inkey;
202	yprk.key.keydat_len = inkeylen;
203
204	memset(&yprv, 0, sizeof yprv);
205
206	r = clnt_call(ysd->dom_client, YPPROC_MATCH,
207	    xdr_ypreq_key, &yprk, xdr_ypresp_val, &yprv, tv);
208	if (r != RPC_SUCCESS) {
209		clnt_perror(ysd->dom_client, "yp_match: clnt_call");
210		ysd->dom_vers = -1;
211		goto again;
212	}
213	if (!(r = ypprot_err(yprv.stat))) {
214		*outvallen = yprv.val.valdat_len;
215		if ((*outval = malloc(*outvallen + 1)) == NULL) {
216			r = YPERR_YPERR;
217			goto out;
218		}
219		(void)memcpy(*outval, yprv.val.valdat_val, *outvallen);
220		(*outval)[*outvallen] = '\0';
221#ifdef YPMATCHCACHE
222		if (strcmp(_yp_domain, indomain) == 0)
223			if (!ypmatch_add(inmap, inkey, inkeylen,
224			    *outval, *outvallen))
225				r = YPERR_RESRC;
226#endif
227	}
228out:
229	xdr_free(xdr_ypresp_val, (char *) &yprv);
230	_yp_unbind(ysd);
231	return r;
232}
233
234int
235yp_next(indomain, inmap, inkey, inkeylen, outkey, outkeylen, outval, outvallen)
236	const char     *indomain;
237	const char     *inmap;
238	const char     *inkey;
239	int             inkeylen;
240	char          **outkey;
241	int            *outkeylen;
242	char          **outval;
243	int            *outvallen;
244{
245	struct ypresp_key_val yprkv;
246	struct ypreq_key yprk;
247	struct dom_binding *ysd;
248	struct timeval  tv;
249	int             r;
250
251	if (indomain == NULL || *indomain == '\0' ||
252	    strlen(indomain) > YPMAXDOMAIN || inmap == NULL ||
253	    *inmap == '\0' || strlen(inmap) > YPMAXMAP)
254		return YPERR_BADARGS;
255
256	*outkey = *outval = NULL;
257	*outkeylen = *outvallen = 0;
258
259again:
260	if (_yp_dobind(indomain, &ysd) != 0)
261		return YPERR_DOMAIN;
262
263	tv.tv_sec = _yplib_timeout;
264	tv.tv_usec = 0;
265
266	yprk.domain = (char *)indomain;
267	yprk.map = (char *)inmap;
268	yprk.key.keydat_val = (char *)inkey;
269	yprk.key.keydat_len = inkeylen;
270	(void)memset(&yprkv, 0, sizeof yprkv);
271
272	r = clnt_call(ysd->dom_client, YPPROC_NEXT,
273	    xdr_ypreq_key, &yprk, xdr_ypresp_key_val, &yprkv, tv);
274	if (r != RPC_SUCCESS) {
275		clnt_perror(ysd->dom_client, "yp_next: clnt_call");
276		ysd->dom_vers = -1;
277		goto again;
278	}
279	if (!(r = ypprot_err(yprkv.stat))) {
280		*outkeylen = yprkv.key.keydat_len;
281		if ((*outkey = malloc(*outkeylen + 1)) == NULL)
282			r = YPERR_RESRC;
283		else {
284			(void)memcpy(*outkey, yprkv.key.keydat_val, *outkeylen);
285			(*outkey)[*outkeylen] = '\0';
286		}
287		*outvallen = yprkv.val.valdat_len;
288		if ((*outval = malloc(*outvallen + 1)) == NULL)
289			r = YPERR_RESRC;
290		else {
291			(void)memcpy(*outval, yprkv.val.valdat_val, *outvallen);
292			(*outval)[*outvallen] = '\0';
293		}
294	}
295	xdr_free(xdr_ypresp_key_val, (char *) &yprkv);
296	_yp_unbind(ysd);
297	return r;
298}
299